Air Suspension Question

[DUTCH VanAtlanta]

Is there a sketch of the general layout of the air suspension on the Cayenne available anywhere? I'm not looking for specific parts or locations, but just a general schematic or sketch of how it works or is laid out.

I'm trying to determine if the air compressor supplies air directly to the struts through control unit valves; or if it first goes to the reserve tank located under the floor of the cargo area, with the reserve tank supplying to the struts through the control unit and valves.

I'm pretty sure that there is a leak in the system somewhere, since the air compressor runs almost constantly with very brief periods off for the first few miles of driving the car after it's been parked for a while.. Dealer service measured the ride height before and after it was parked over the weekend, and found that it did not drop. They use this to say that there is no leak in the system. I'm thinking that this only proves that there are no leaks in the struts and back as far as the control unit valves

If the compressor supplies the reserve tank and the reserve tank supplies the struts, I am thinking that the leak may be between the compressor check valve (replaced in this quest) and the reserve tank or between the reserve tank and the control unit valves.

I really want to get this fixed, but the dealer has thwon up his hands and says that, since it doesn't settle overnight, it's within spec; and there's nothing more that they can do. I really don't want to have to go LemonLaw on this thing. I have had two different passengers ask me "What is that noise?" when the compressor starts running at first drive. It's very noisy!

So a sketch or a functional schematic of the system would really be helpful in trying to make sense of this problem. TIA if you can help!

Edited December 9, 2009 by DUTCH VanAtlanta

[DUTCH VanAtlanta]

Found Porsche's on line parts manual. This helped a bunch. No need for further help. Thanks.